Sub-band phase calibration in stepped frequency GB noise SAR

The paper describes a method of band synthesis in a stepped frequency ground-based (GB) noise synthetic aperture radar (SAR) in case the of phase offset between reference and surveillance channel changing along with the carrier frequency switching. The method is based on receive channel calibration using crosstalk signal between transmitting and receiving antenna, dominating over the scene echoes. The paper shows a method of phase offset estimation and correction and results of its application to SAR data obtained with a radar system constructed using universal commercial off-the-shelf (COTS) measurement instruments.